Twirler ring for typewriter platens



Feb. 16, 1937.

C. J. WATSON TWIRLER RING FOR TYPEWRITER PLATENS Filed May 9, I936Patented Feb. 16, 192.7

UNITED STATES TWIRLER RING FOR TYPEWRITER PLATENS Charles J. Watson,Brooklyn, N. Y., assignor to Peerless Key Company, Inc., New York, N.Y., a corporation of New York Application May 9, 1936, Serial No. 78,762

5 Claims.

This invention relates to improvements in twirler rings for use ontypewriter platens.

It has been found desirable to facilitate the .rotation of platensfor'typewriters to provide the knobs of the platens with twirler ringsgenerally made of rubber or a similar material. Heretofore, twirlerrings have been objectionable in that they gripped the knobs of theplaten so tightly that the rings were hard to the touch.

It is an object of this invention to provide a twirler ring which canfirmly grip the knob -of a typewriter platen and at the same time have acushioning effect which is easy upon the fin gers of an operator.

A further object is the provision of a twirler ring for typewritershaving an internal circumferential groove centrally positioned so as toproduce a cushioning eifect, without impairing the grip of the ring onthe knob of a typewriter.

These and other advantageous objects which will later appear, areaccomplished by the simple and practical construction and arrangement ofparts hereinafter described and exhibited in the accompanying drawing,forming part hereof, and in which:

Fig. 1 is a side view, of a knob for typewriter platens having fixedthereon a twirler ring embodying my invention,

Fig. 2 is an elevational view partly in section of a portion of a platenand knob therefor, having mounted thereon twirler ring in accordancewith my invention,

Fig. 3 is a sectional view of a portion of the twirler ring showing themanner in which the cushioning effect is produced, and

Fig. 4 is a sectional view of a modified form of the invention.

Referring to the drawing, there is shown a platen 4 mounted on a shaft 5having a circular knob 6 which is knurled as is customary intypewriters. Mounted on the knob 6 is a twirler ring which comprises anannulus I made of rubber or similar material and having the outerperiphery thereof knurled and the inside of the twirler ring being alsopreferably knurled to grip the knurled surface of the knob 6. Theannulus I has a flange 8 on the outer side of the knob 6 and a shorterflange 9 on the inner side of the knob.

In order to produce a cushioning effect, the annulus I is provided onthe inner surface thereof with a centrally positioned circumferentialgroove 10 which is bordered on each side by the knurled portions H andI2 which firmly grip the knob 6 as above described.

As shown in Fig. 3, when the twirler ring I and the knob 6 are gripped,due to the groove II] a cushioning effect is produced which is morepleasant to the touch than has heretofore been the case with twirlerrings of the type described.

In Fig. 4 is shown a modified form of the invention in which the annulusis provided with a centrally positioned circumferential groove 20 andhas a plurality of spaced ribs 2| projecting into the groove. The ribs2| contact the knob 6 and provide sufficient support for the collapsingof the twirler ring.

The foregoing disclosure is to be regarded as descriptive andillustrative only, and not as restrictive or limitative of theinvention, of which obviously an embodiment may be constructed includingmany modifications, without departing from the general scope hereinindicated and denoted in the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is: V

l. A twirler ring for knobs of typewriter platens, comprising an annulushaving on the inner surface thereof a centrally positionedcircumferential groove, and a plurality of space-d ribs projecting intothe groove.

2. A twirler ring for knobs of typewriter platens, comprising an annulushaving on the inner surface thereof a centrally positioned circum--ferential groove, the surface of the annulus bordering the groove beingknurled to enable it to firmly grip a platen knob.

3. A twirler ring for knobs of typewriter platens, comprising an annulushaving on the inner surface thereof a centrally positionedcircumferential groove, a plurality of spaced ribs projecting into thegroove, and having an inner and outer flange of different dimensions.

4. A twirler ring for knobs of typewriter platens, comprising an annulushaving on the inner surface thereof a centrally positioned circumfertialgroove with parallel side walls, the inner surface of the annulusbordering the groove being knurled to enable it to firmly grip a platenknob.

5. A twirler ring for knobs of typewriter platens, comprising an annulushaving on the inner surface thereof a centrally positioned circumfertialgroove with parallel side walls, the inner surface of the annulusbordering the groove being knurled to enable it to firmly grip a platen'knob, and a plurality of spaced ribs projecting from the bottom of thegroove to engage a platen to provide sufficient support to preventcollapsing of the twirler ring.

CHARLES J. WATSON.

